h1{
    text-align: center;
    padding: 20px;
}
.marCenter{
    width: 300px;
    height: 300px;
    margin: 0 auto;
    background-color: rgba(0, 0, 0, 0.1);
    position: relative;
}
.zp{
    width: 300px;
    height: 300px;
    background-color: #f5a;
    border-radius: 100px;
}
.zx{
    width: 60px;
    height: 60px;
    background-color: #fa5;
    border-radius: 100%;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -30px;
    margin-left: -30px;
    cursor: pointer;
}